Chelating Resins Containing 1, 4, 8, 11 -Tetraazacyclotetradecane- 5, 7-dione Based on Crosslinked Copolymer Beads of the Macroreticular Type

Abstract

Chelating resins containing a macrocyclic ligand, 1, 4, 8, 11-tetraazacyclotetradecane-5, 7-dione, were prepared by ligand reactions with two different crosslinked copolymer beads of the macroreticular type: chloromethylated styrene- divinylbenzene (RCS) and glycidyl methacrylate-divinylbenzene (RG) copolymers. Although both resins have nearly equal amounts of the fixed ligand, the RG-based resin (RGD) shows a much higher uptake of Cu(II) than does the RCS- based resin (RCSD). This indicates that the complexing ability of the fixed ligand is strongly influenced by copolymer matrices. A further detailed study of RGD revealed that the characteristics of RGD include high selectivity toward Cu(II) and a rapid elution rate of Cu(II) with an aqueous solution of strong acid. The usefulness of RGD in the separation of Cu(II) has been demonstrated by means of column operation.